Machine for edge-sawing lumber



(No Model.) 4 Sheets-Sheet 1.

H. A. HOLT.

MACHINE FOR EDGE SAWING LUMBER.

No. 536,832. Patented Apr. 2, 1895.

@ Ill i w U (No Model.) 1 4 Sheets-Sheet 2.

H. A. HOL'l. MACHINE FOR EDGE SAWING LUMBER.

No. 536,832. Patented Apr. 2, 1895.

(No Model.) 4 Sheets-Sheeb 3. H. A. HOLT.

MACHINE FOR-EDGE SAWING LUMBER.

N0. 536,832. Patented Apr. 2,1895.

(No Model.) 4 Sheets-Sheet 4. H. A. 'HOLT.

MACHINE FOR EDGE SAWING LUMBER.

Pate ted Apr. 2. 1895.

No. 536,832. g

litre STATES HENRY HOLT, OF WVILTON, NEW HAMPSHIRE.

MACHINE FOR EDGE-SAWiNG LUMBER.

SPECIFICATION forming part of Letters Patent No. 536,832, dated April 2, 1895.

Application filed November 19, 1892. Renewed June 29, 1894. Serial No. 516,127. (No model.)

. ton, in the county of Hillsborough and State of New Hampshire, have invented certain new and useful Improvements in Machines for Edge-Sawing Lumber, of which the following is a specification.

This invention relates to machines for edgesawing lumber, and has in view for one thing, the provision of a carriage for the lumber which is so narrow as to permit the sawing of the narrowest strips.

Another object is to provide simple and convenientlyoperated devices for dogging the lumber.

A third object is to provide improved means for controlling the reversible driving mechanism by the travel of the carriage, and a fourth object is to provide means for automatically releasing the lumber from the dogs on thecompletion of the sawing.

To the above ends, the invention consists in certain novel combinations of parts which are recited in the appended claims.

The accompanying drawings illustrate a machine embodying the invention.

Figure 1 shows the machine complete, in front elevation. Fig. 2 shows the same in top plan, with the bed or table broken out at one part to disclose parts under it. Fig. 3 shows a broken longitudinal section of the machine. Fig. 3 shows a cross-section taken on line 3--3 of Fig. 3. Fig. 4. shows the'head and tail-blocks of the carriage in plan, and certain adjuncts thereof, some parts being represented as broken away and others indicated by broken lines. in rear elevation,and certain adjuncts thereof, full lines showing one adjustment of parts and broken lines another. Figs. 6 and 7 show respectively a rear end elevation and a longitudinal section of the tail-block. Fig. 8 shows a top plan view of the reversible driving mechanism and the saws. Fig. 9 shows a detail of said adjusting means.

'lhelettera designates the supporting frame of the machine, and b a horizontal bed or table on said frame. At the forward part of the 1 table there is formed a channel 12 extending the full length of the table, and a track consisting of a single line of rails 'i is laid in the said channel, the rails being preferably dove- Fig. 5 shows the headblock tailed in cross-section. Fitted to the said track are the head and tail-blocks g and 71,

between which the lumber is carried. A rod f" is fastened at one end in the head-block g, and passes loosely through the tail-block h, and is fastened at the other end in an auxiliary block a' which fits the track.

A piece of board tobe sawed is placed on the table 1), between the head and tail-blocks, and is slid over said table by the action of the tail-block against it. The said tail-block is adjusted to the length of the board by sliding it along on the rod f", and is clamped to said rod by means of a cam-lever h" (see Fig. 7) or other suitable means of convenient manipulation.

The front end of the piece of lumber is wedged under a dog j" on the block g, and the block 71 carries affixed on its upper side a'dog i", which is caused to penetrate the rear end of the lumber by movement of said block h to clamping position. 7

The blocks g and h, the rodf", and the auxiliary block a', may be said to constitute a carriage, which carriage is caused. to traverse the track '5 by the following-described mechanism: A cable Z isattached at one end to the block a, and at the other end to the block g, the latter attachment being effected by means of a cam-lever 2 which is pivoted to a lug on the block and engages an eye 3 on the cable. (See Fig. 5.) The object of this mode of connection is to secure detachability; for by throwing the lever 2 upward, the tension of the cable is relaxed and its eye can be readily disengaged from the lever, whereas by turning said lever down when engaged with the eye, the cable is drawn taut and the eye is carried over the levers center so that said lever is held down. The strain of the cable is taken by the 1 driving friction-wheels s u, which determine the direction of rotation of the wheel r and consequently the drum 7c. The frictionwheel sis carried by the journal of a cone'pulley t, whereas the wheel u is on the journal of a gear 1; which meshes with a gear to on the journal of a cone-pulley 0c. The two cones are connected by a belt a, and the cone 8 is driven through any suitable connection with asource of power. It is here shown as connected by a crossed belt y with the saw-shaft c, which carries a pnlleyf for connection in any suitable manner with a source of power.

For varying the speed of the cones, I provide a shipper c engaging the belt 2, the said shipperbeing affixed to a sliding rod Z which is engaged by a lever z accessible at the front of the machine.

Connected with the pendent portion f of the frame q, there is a rod g which also connects with a crank e affixed to a shaft (1 carrying a segment 0' in mesh with a segment i) on the lowerend of a lever a. The said lever extends upward through a slot in the table I) and in easy reach of an attendant who by operating said lever can reverse the motion of the carriage at will; for it will be seen that movement of the lever is transmitted to the swinging frame q. The two extremes of the levers movements are indicated in Fig. 3 by full and dotted lines, and the corresponding positions of co-acting parts are similarly indicated. There is an intermediate position of parts when no motion is transmitted to the drum and theleverstands perpendicular, and this adjustment is caused to be automatically assumed at the end of each movement of the carriage, through the followingdescribed -means, reference being had to broken-line illustration in Fi 2:

A pair of levers v" and c are pivoted on the under side of the table and extend by the lever a on opposite sides thereof; and rods 1*" and c are connected with said levers respectively and extend along under the table for a considerable distance to allow for the runs of the carriage. At their ends the said rods are formed with offsets q" and b' which project into the channel 12 for abutment of a pendent lug h (see Fig. 6) on the block h, and of the block a respectively, the former abutting the offset q" at the end of the forward run of the carriage, and the latter abutting the offset b' at the end of the backward run.

The movement of the reach-rod 1" or 0 produced by such abutment shifts the lever with which it connects and causes said lever to act against the lever a and move the latter to vertical position, the said lever a, by its movement which sets the carriage in motion, having come to bear against the shifting lever.

In conjunction with the rod 7", there are arranged devices for automatically disengaging the dog j of the head-block from the board when the carriage has reached the limit of its forward run, the said devices being of the following description, with reference more particularly to Figs. 2, 4, and 5: The said dog j" is pivoted to the block g and pressed forward for engagement with the board by a spring y, and normally locked in the forward position by engagement of the catch of a pivoted pawl 74;" on the block with a shouldered collar on the pivot of the dog, the said pawl being also actuated by the spring y". The said pawl lies longitudinally of the block g, and has a beveled rear end, as clearly shown in Fig. 5. A block Z" is fitted to the track i and carries on one side a spring-latch m" for engagement with a notch n in the head-block g. The said block Z" is formed with upstanding ears through which a bolt 19" is fitted to slide, the said bolt being pressed back by a spring 0" surrounding it beyond the blockl" and bearing atone end against the latter and at the opposite end against the head of the bolt. The forward end of said bolt is beveled for co-action with the bevel of the pawl 76'. A holding-rod u extends along under the table inwardly beyond the rod 9, and said rod it" has an outwardly bent end formed to embrace the bolt 19" to which it is fastened. The rod to extends between clamping jaws i" and 25' one of which is movable and the other fixed, and the movable jaw t" is beveled on the outer side for engagement of the back edge of the rod 9'. The latter is formed with an oblique edge .9" at the base of the offset q, which oblique edge is adapted to be acted upon by the lug M of tail-block h.

In the advance of the carriage, its block g runs behind the spring-latch m, and the latter snaps into the notch n". Then the block 1" is carried forward with the block 9 and also with the bolt 19 and rod to, until the lug h by acting on the oblique edges" presses the jaw i" against the rod u", when the latter is locked and hence holds the bolt 1)" from further movement, so that the continued advance of the head-block carries the beveled end of the pawl is upon the beveled end of theholt, and this effects displacement of said pawl and release of the dogj.

In the return movement of the carriage, the head-block carries the block Z with it until the latter is restored to its initial position. It will be understood that in this return movement the blocks Z and 9 move before the rod to and bolt 19'', so that the pawl 70 is taken free of the said bolt and is restored to engagement with the collar 79' by the spring y", which also restores the dogj to position for engagement with the next piece of lumber.

A lug z under the table stands in the path of the latch m" on the return movement, and when said latch encounters this lug it is moved out of engagement with the notch n" (see Fig.

l'IC

IZC

2), and the head-block then leaves the block Z.

device is to allow for varying lengths of boards,

thereto.

for it will be apparent that the extent ofthe advance of the carriage depends on the length of the board, as it is the tail-block which throws the machine out of action, and this tail-block is adjusted to the length ofboard. Th erefore the release of the sawed boards must depend on their length, so that their rear ends will always stop at the same place. Sufficient range of movement is provided forin the releasing devices to accommodate any length of board, and the sliding block Z is always brought back where it will be acted upon by the advancing head-block. The lug z" is a fixture which determines the position in which the block Z shall be left.

The saw-shaft or arbor c hereinbefore mentioned extends under the track 2', and is here shown 'as equipped with two saws d and e, the saw d being fixed to the shaft in line with the inner side of the channel b whereas the saw a is adjustable on the shaft, being splined The saw 6 is adjusted through the following means: Said saw has an extended hub p formed with an encircling groove g, which is engaged by a fork r whose shank s is adjustably fastened in an arm 15 (see Figs. 8 and 9) having a long boss 25 which is pivoted on screws 10' entered through ears 2) of a dovetailed slide to which fits agroove of corresponding form in a bar w fastened to the frame of the machine and extending parallel with the saw-arbor. Said bar as has a rack y on its under side engaged by a pinion z on one end of a shaft at" whose opposite end carries a bevel-pinion b (see Fig. 2) meshing with a bevel-gear c" on a cross-shaft d carrying a hand-wheel e" on its outer end. It will beseen that by turning said hand-wheel the slide to is moved, and consequently the saw 6. The position of said saw determines the width of the strip cut from the board passing through, and the saw is adjusted by a gage 0 extending over it.

On the upper side of the table I), somewhat back from the channel b there is a guideboard h which extends parallel with the edge of the table at said channel, and is adjustable to vary the distance between it and that edge, its adjustment being effected through the following-described means: Racks 'Z'are fastened to the rear side of the board, and they are engaged by pinions j on a shaft it, which also carries a worm-wheel Z engaged by a Worm on an inclined shaft m supported in suitable bearings erected on the table and carryinga hand-wheel n. It will be seen that by turning said hand-wheel the guide-board will be moved. forward or back according to which way the wheel is turned. The guide-board determines the width of a strip to be cut from one side of a board by the saw d, and said guide-board is'adjusted by a gage 0" extending above it (see Fig. 3 the guide-board having an index-finger h pointing toward the gage. This= gage 0" and the gage o are shown as marked on the same bar, which extends entirely across the machine.

The general operation of the machine may be stated as follows:The carriage being ready for a forward run, as shown in Figs. 1 and 2, the board to be operated upon is brought onto the table, and its forward end wedged under the dog j of block 9. The board is let down to rest flat on the table, covering the channel b and the block it is moved along the rod f", and its dog caused to penetrate the rear end of the board. The said block 71. is thenlocked to the rod f" by means of the cam-lever h". The attendant shifts the lever a, so as to start the cable, and the carriage advances, taking the board onto the saw or saws. The tail-block moves far enough past the saws to give ample freedom for removing the sawed board. As the tail-block reaches the end of its movement, the automatic release of the dog j" takes place in the manner before explained, simultaneously with the stoppage of the carriages advance. The attendant now moves the lever a to start the cable in the reverse direction to that in which it before moved, and the carriage is run back, the releasing-block Z" being brought back to normal position in the manner before explained. To prevent a strip which may be left on the outer side of the saw d from being carried back, a spring-catch w is provided to engage it on the under side. (See Fig. 1.) The backward run of the carriage is stopped by the auxiliary block a coming against the offset b and shifting the lever a, as has been before explained.

When a single strip is cut from a board, the guide-board h is not used, but the board to be sawed is placed with its inner edge parallelwith the inner edge of the channel I) and overlapping the same only enough to have the edge of the board trimmed off. The saw e having been adjusted to the width of strip desired saws off the strip while the saw d trims the edge.

When two strips are to be cut from a board, the guide-board h is adjusted the distance from the edge of the channel 5 corresponding with the width of strip desired, and the board to be sawed is placed on the table with its inner edge (which has been previously trimmed) against the said guide-board. Then when the board is run through, one strip is sawed 0d by the saw d between the latter and the guide-board, and another strip is sawed off by the saw e betweenthe latter and the saw (1. Of course it will be apparent that any number of saws might be used.

For the purpose of pushing the piece removed between the saw d and guide h out beyond the saws, I fasten a yoke-shaped piece e to the tail-block h,the-s'nape of said piece allowing it to pass over the saw d and continue in engagement with the rear end of the board.

It is to be particularly noted that the car- ICO riagc is so narrow that it can pass between the saws when they are very close together, and hence strips as narrow as ever required can be produced.

I claim 1. In a machine for edge-sawinglumber, the combination of a horizontal table on which the lumber slides, the said table having a nar row longitudinal channel, a track on the base of said channel; head and tail blocks fitting the track and each having a dog for engagement with the lumber; and a driving cable connected with the two blocks, the tail block being adjustable.

2. In a machine for edge-sawinglumber, the combination of a horizontal table on which the lumber slides, the said table having a narrow longitudinal channel; a track on the base of said channel; head and tail blocks fitting the track and each having a dog for engagement with the lumber; a rod extending between the two blocks and rigidly connected with the head-block while the tail-block may slide on the rod and is equipped with means for locking it at diiferent positions; and a driving cable connected with the rod.

3. In a machine for edge-sawing lumber, the combination of a horizontal table on which the lumber slides, the said table having a narrow longitudinal channel; a track on the base of said channel; head and tail blocks fitting the track and each having a dog for engagement with the lumber; a rod fastened at one end to the head-block and extending loosely through the tail-block which is provided with clamping devices; an auxiliary block fastened to the rod; a cable connected with the headblock and the said auxiliary block; reversible driving mechanism connected with the cable; and reversing means arranged to be tripped by the tail-block and the auxiliary block.

4. A machine for edge-sawing lumber, comprising in its construction a reciprocating carriage having a fixed dog 6" at one end, a pivoted dog j at the other end and havingaheel engaged by a pivoted pawl and means for positively moving the said pawl to cause it to engage and disengage the heel of the dogj", substantially as described.

5. A machine for edge-sawinglumbercomprising in its construction a reciprocating carriage composed of block it having dog 2' and block 9 having pivoted dogj, latch pawl 70" and notch n, the block Z having spring latch m", a spring bolt 19" carried by block Z and having an inclined end to act on pawl 70", and means for disengaging the latch m from the notch 77.", substantially as described.

6. A machine for edge-sawing lumber, comprising in its construction edging saws,a reciprocatin g carriage embracing a head-block, a tail-block, and a connecting rod, the tailblock being provided with a fixed dog and with means for adjustably securing it to the said rod, and the head-block being provided with a pivoted dogj" having a heel engaged by a pivoted pawl 70'', and means for positively moving said pawl to cause it to engage and disengage the heel of the dogj, substantially as described.

7. A machine for edge-sawing lumber comprising in its construction edging saws, a carriage embracing a head-block and a tail-block adj ustably connected together and provided with dogs for holding the lumber, means for reciprocating the carriage,a lever a for controlling the operation of the said reciprocating mechanism, the sliding rods 9'' c', the lovers 2;" d' connected to said rods and extending on opposite sides of the lever a, and projections on the carriage adapted to engage with and move the sliding rods, whereby the levers r d' may be caused to move the lever a to stop the carriage at each end of its travel.

8. A machine for edge-sawing lumber comprising in its construction edging saws, a sliding carriage, a drum, flexible connections between the carriage and drum, means including a rocking frame for reversing the direction of rotation of the drum, the lever a for controlling the operation of the reversing mechanism, the sliding rods 7 c, the levers o d' connected to said rods and extending on opposite sides of the lever a, and projections on the carriage adapted to engage with and move the sliding rods, whereby the levers o 01 may be caused to move the lover a to stop the carriage at each end of its travel.

9. In a machine for edge-sawing lumber, the combination with a reciprocating carriage having a head-block with a movable dog for engaging the lumber and a detent for locking and releasing the said dog, and an adjustable tail-block; of a slide in front of the carriage, a latch to connect it therewith, a trip loosely mounted on the slide and arranged to coact with the clog-engaging detent, a holding rod fastened to said trip, and means actuated by the tail-block of the carriage for locking said rod.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, this 5th day of November, A. D. 1892.

HENRY A. HOLT.

Witnesses:

Moses CLARK, HANNAH L. CLARK.

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